So I got a boss dm-2w in the mail today. A used one in supposedly mint condition. I can help but notice the this high pitch noise on top of the repeats that almost sounds like a bit crusher or something similar. It's very subtle but quite annoying. My question is.. is this normal for the pedal or is it damaged? Because if it's not normal I will have to open a reverb dispute most likely. I'm used to noise when it comes to analog delays and I've owned many but that noise was almost like a white noise.. static like. It didn't make a specific note/notes.